Additional capital contributions to related party.

No definition available.

Name:	bbgi_AdditionalCapitalContributionsRelatedPartyEntity
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of units owned in related party.

+ References

No definition available.

+ Details

Name:	bbgi_CapitalContributionsRelatedPartyEntity
Namespace Prefix:	bbgi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Conversion of note receivable and accrued interest to equity investment.

+ References

No definition available.

+ Details

Name:	bbgi_ConversionOfNoteReceivableAndAccruedInterestToEquityInvestment
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument bearing interest rate.

+ References

No definition available.

+ Details

Name:	bbgi_DebtInstrumentBearingInterestRate
Namespace Prefix:	bbgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Gain On Sale Of Lease Property Recognised.

+ References

No definition available.

+ Details

Name:	bbgi_DeferredGainOnSaleOfLeasePropertyRecognised
Namespace Prefix:	bbgi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of radio towers sold to unrelated party.

+ References

No definition available.

+ Details

Name:	bbgi_NumberOfRadioTowersSoldToUnrelatedParty
Namespace Prefix:	bbgi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Repayments of prepaid rent that was met by related party on behalf of the company to unrelated party.

+ References

No definition available.

+ Details

Name:	bbgi_RelatedPartyRepaymentsOfPrepaidRent
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of stations leasing towers from related party.

+ References

No definition available.

+ Details

Name:	bbgi_RelatedPartyTransactionNumberOfRadioStations
Namespace Prefix:	bbgi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of radio towers sold to related party.

+ References

No definition available.

+ Details

Name:	bbgi_RelatedPartyTransactionNumberOfRadioTowersSold
Namespace Prefix:	bbgi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(3),(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_StatementGeographicalAxis=bbgi_AugustaGAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_BeasleyBroadcastingManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_BeasleyFamilyTowersIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=bbgi_LeaseAgreementsTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=bbgi_PrepaidRentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=bbgi_LeaseAgreementsOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=bbgi_LeaseAgreementsThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_GGBAugustaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_GGBEsteroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_GGBLasVegasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_LN2DBLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_WintersrunCommunicationsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=bbgi_CharlotteNCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bbgi_WintersrunCommunicationsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Additional Information (Detail)												12 Months Ended
	Oct. 25, 2019	Mar. 28, 2019 USD ($)	Jun. 18, 2018 USD ($)	Feb. 22, 2017 USD ($)	May 03, 2016 USD ($)	Nov. 17, 2015 Automatic-Renewal	Apr. 04, 2014 USD ($)	Apr. 10, 2013 USD ($)	Jul. 31, 2012 USD ($)	Feb. 14, 2012 USD ($)	Mar. 25, 2011 USD ($) shares	Dec. 31, 2019 USD ($) Radio-Stations Tower	Dec. 31, 2018 USD ($)	Oct. 16, 2015 USD ($)	Apr. 03, 2015
Related Party Transaction [Line Items]
Proceeds from sale of tower												$ 26,349,462
Percentage of outstanding units ownership interest in Investee			20.00%				20.00%	20.00%							20.00%
Conversion of note receivable and accrued interest to equity investment													$ 187,618
Impairment losses												13,657,941
Augusta GA [Member]
Related Party Transaction [Line Items]
Proceeds from sale of tower		$ 500,000
Beasley Broadcasting Management, LLC [Member]
Related Party Transaction [Line Items]
Lease or rental expense												200,000	200,000
Beasley Family Towers Inc [Member]
Related Party Transaction [Line Items]
Lease or rental expense												11,000	13,000
Deferred gain on sale of lease property recognised	0.8
Beasley Family Towers Inc [Member] \| April 30, 2021 [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 0	0
Lease agreement expiration date												Apr. 30, 2021
Number of radio towers sold to unrelated party \| Automatic-Renewal						2
Repayment of prepaid rent to related party												$ 100,000
Beasley Family Towers Inc [Member] \| April 30, 2021 [Member] \| Prepaid Rent [Member]
Related Party Transaction [Line Items]
Prepaid expense paid by related party													100,000
Beasley Family Towers Inc [Member] \| December 28, 2020 [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 400,000	400,000
Number of radio stations for which radio tower leased \| Radio-Stations												19
Lease agreement expiration date												Dec. 28, 2020
Beasley Family Towers Inc [Member] \| Lease Agreements Three [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 200,000	100,000
Number of radio towers sold for radio station \| Tower												1
Lease agreement expiration date												Dec. 31, 2038
Beasley Family Towers Inc [Member] \| Augusta GA [Member]
Related Party Transaction [Line Items]
Number of radio towers sold for radio station \| Tower												1
Proceeds from sale of tower												$ 1,300,000
GGB Augusta, LLC [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 44,000	45,000
Lease agreement expiration date												Nov. 01, 2023
GGB Estero, LLC [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 200,000	200,000
Lease agreement expiration date												Aug. 31, 2024
GGB Las Vegas, LLC [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 200,000	200,000
Lease agreement expiration date												Dec. 31, 2023
LN2 DB, LLC [Member]
Related Party Transaction [Line Items]
Additional contribution to related party			$ 150,000	$ 150,000	$ 166,667		$ 104,167	$ 104,167	$ 104,167	$ 62,500	$ 250,000
Related party stock purchase \| shares											25,000
Percentage of outstanding units ownership interest in Investee					20.00%				20.00%		20.00%
Note bearing interest rate				18.00%
Conversion of note receivable and accrued interest to equity investment			$ 187,618
Impairment losses												$ 1,300,000
Wintersrun Communications Inc
Related Party Transaction [Line Items]
Lease or rental expense												$ 100,000	100,000
Number of radio stations for which radio tower leased \| Radio-Stations												1
Wintersrun Communications Inc \| Prepaid Rent [Member]
Related Party Transaction [Line Items]
Prepaid expense paid by related party														$ 300,000
Wintersrun Communications Inc \| Augusta GA [Member]
Related Party Transaction [Line Items]
Lease or rental expense												$ 31,000
Lease agreement expiration date												Oct. 16, 2025
Wintersrun Communications Inc \| Charlotte, NC [Member]
Related Party Transaction [Line Items]
Number of radio towers sold for radio station \| Tower												1
Wintersrun Communications, LLC
Related Party Transaction [Line Items]
Lease agreement expiration date												Dec. 31, 2025
Wintersrun Communications, LLC \| Augusta GA [Member]
Related Party Transaction [Line Items]
Lease or rental expense													$ 31,000
Wintersrun Communications, LLC \| Charlotte, NC [Member]
Related Party Transaction [Line Items]
Proceeds from sale of tower												$ 400,000